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Secondary battery

a secondary battery and battery technology, applied in secondary cell servicing/maintenance, cell components, electrochemical generators, etc., can solve the problems of limit in solving the above-mentioned problems, and the use of silicon-based active materials is not universally used, so as to improve the lifespan, improve the rate, and improve the effect of li

Pending Publication Date: 2022-01-13
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a type of battery that solves problems associated with the expansion of the negative electrode when using a certain material. The battery has a specific ratio between the positive and negative electrodes, which reduces the impact of this problem and improves its lifespan. Additionally, the battery can achieve high capacity, rate properties, and energy density using the silicon-based material.

Problems solved by technology

However, a silicon-based active material is not universally used due to the problem of volume expansion according to charge / discharge and the deterioration in lifespan properties caused thereby.
However, there is a limit in solving the above-mentioned problems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

ring of Secondary Battery

[0085]

[0086]A silicon-based active material Si (Average particle diameter (D50): 3.5 μm), which is a negative electrode active material, carbon black (Product name: Super C65, Manufacturer: Timcal), which is a negative electrode conductive material, and a mixture (Weight average molecular weight: about 360,000 g / mol) in which polyvinyl alcohol and polyacrylic acid are mixed in a weight ratio of 66:34, which is a negative electrode binder, were added to distilled water, which is a solvent for forming a negative electrode slurry, in a weight ratio of 70:10:20 to prepare a negative electrode slurry (Solid content concentration: 25 wt %).

[0087]The negative electrode slurry was coated on one surface of a copper current collector (Thickness: 15 μm), which is a negative electrode current collector, with a loading amount of 4.28 mg / cm2 (10.1 mAh / cm2), roll-pressed twice (first roll-pressing gap 0.97 μm, second roll-pressing gap 1.19 μm) using a roll press, and then ...

example 4

[0100]A secondary battery of Example 4 was manufactured in the same manner as in Example 1, except that the gap of the roll press during the first roll-pressing was set to 0.79 μm and the gap of the roll press during the second roll-pressing was set to 1.11 μm in the manufacturing of the negative electrode.

[0101]In the secondary battery of Example 4, the thickness of the negative electrode active material layer was 32.5 μm, the thickness of the negative electrode was 47.5 μm, and the porosity of the negative electrode was 34.3%.

example 5

[0102]A secondary battery of Example 5 was manufactured in the same manner as in Example 1, except that the gap of the roll press during the first roll-pressing was set to 1.01 μm and the gap of the roll press during the second roll-pressing was set to 1.76 μm in the manufacturing of the negative electrode.

[0103]In the secondary battery of Example 5, the thickness of the negative electrode active material layer was 41 μm, the thickness of the negative electrode was 56 μm, and the porosity of the negative electrode was 48.0%.

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PUM

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Abstract

The present invention provides a secondary battery including a negative electrode having a negative electrode active material layer containing a negative electrode active material, a positive electrode facing the negative electrode and having a positive electrode active material layer containing a positive electrode active material, a separator interposed between the negative electrode and the positive electrode, and an electrolyte, wherein the negative electrode active material includes a silicon-based active material and an N / P ratio calculated by a specific equation is 1.92 to 2.60.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of Korean Patent Application No. 10-2019-0028272, filed on Mar. 12, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.TECHNICAL FIELD[0002]The present invention relates to a secondary battery.BACKGROUND ART[0003]Recently, the demand for a small and lightweight secondary battery having a relatively high capacity is rapidly increased due to the rapid spread of electronic devices using batteries, such as cell phones, notebook computers, electric vehicles, and the like. Particularly, a lithium secondary battery is lightweight and has a high energy density, and thus, is attracting attention as a driving power source for portable devices. Therefore, research and development efforts for improving the performance of a lithium secondary battery have been actively conducted.[0004]Typically, a lithium secondary battery includes a positive ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/134H01M4/131H01M4/38H01M4/505H01M4/525H01M10/0525H01M4/62
CPCH01M4/134H01M4/131H01M4/386H01M2010/4292H01M4/525H01M10/0525H01M4/622H01M4/505H01M10/42Y02E60/10H01M2004/027H01M2004/021H01M4/483H01M4/13H01M10/052
Inventor KIM, YOUNG JAEYOO, JUNG WOO
Owner LG ENERGY SOLUTION LTD